The FICKES family

Looking for anyone with information on John Fickes and wife Mary Elizabeth Rudisill (or Rudysill).They were married in Cumberland Co. PA in 1806.They had children-Leah, Catherine, John & Jacob (others are unknown).I would like to find the names of all of their children.I would also like to know where John was born-his father was supposedly from Holland, but could have been Germany as well.Sons John and Jacob Fickes settled in Coles Co. Illinois abt. 1831.I would like to know what happened to the parents.Any help would be greatly appreciated & would love to exchange info. with others researching the Fickes surname.